Updated codemirror to v4.12.

Did a lot of cleanup to limit the size of the plugin.
I kept the emmet plugin.

applications/admin/static/codemirror/mode/livescript/index.html

@@ -10,12 +10,12 @@
 <script src="livescript.js"></script>
 <style>.CodeMirror {font-size: 80%;border-top: 1px solid silver; border-bottom: 1px solid silver;}</style>
 <div id=nav>
-  <a href="http://codemirror.net"><img id=logo src="../../doc/logo.png"></a>
+  <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
 
   <ul>
     <li><a href="../../index.html">Home</a>
     <li><a href="../../doc/manual.html">Manual</a>
-    <li><a href="https://github.com/marijnh/codemirror">Code</a>
+    <li><a href="https://github.com/codemirror/codemirror">Code</a>
   </ul>
   <ul>
     <li><a href="../index.html">Language modes</a>
@@ -454,6 +454,6 @@ export prelude = out$
 
     <p><strong>MIME types defined:</strong> <code>text/x-livescript</code>.</p>
 
-    <p>The LiveScript mode was written by Kenneth Bentley (<a href="LICENSE">license</a>).</p>
+    <p>The LiveScript mode was written by Kenneth Bentley.</p>
 
   </article>